Operating principles:A battery charger considerably affects the life and
performance of the battery, which is the main part of every electric
vehicle.A non controlled traditional battery charger (rectifier)
provides a simple direct AC to DC conversion.

In
modern battery chargers these disadvantages are solved with an indirect
AC/DC conversion by passing through an intermediate DC/DC
conversion.

This is the usual method of operation for the SMPS (Switching Mode
Power Supply) at high power. This solution gives a good performance for
minimum cost and physical dimensions using switches - faster and powerful
(modern technology).The main advantages of this solution
are:

•High efficiency•Reduced dimensions•Short charge
times•Charge independent of changes in the main
supply•Electronic control that provides the desired charge
curve.